<?php
  class hey {
  	
  	function hey($name){
  		if($name == ""){
  			$name = "World";
  		}
  		$this->name = $name;
  	}
  	
  	function say_hey(){
  		echo "hey $this->name!\n";
  		echo "how are you doing??\n";
  	}
  	
  }
?>